CVE-2026-50522

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-07-22), indicating real-world exploitation has been confirmed by US federal agencies. the CNA's CVSS baseline 9.8 retained for reference (NVD's own analysis pending). Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, cna:microsoft, epss, ghsa
Trending — 5 sources updated this weekExploited in the wild
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 85%CVSS: 9.8Exploit: cisa kev · ssvc active · epss top5pct · epss high · public exploitExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
99(Act)
EG Risk 99/100SSVC: Act

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS PROB
85%
EPSS %ILE
100%
KEV
⚠ Exploited

Published

July 14, 2026

Last Modified

August 28, 2026

Advisory Details (1)

Auto-updated Aug 28, 2026
Patch available. Sources: microsoft.
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50522

Vendor Advisories for CVE-2026-50522(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 92× in last 7d / 374× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 542 total refreshes for this CVE.

  1. 2026-08-30 06:23 UTCVendor advisory
  2. 2026-08-30 06:23 UTCGHSA enrichment
  3. 2026-08-30 02:04 UTCEG score recompute
  4. 2026-08-30 02:04 UTCVendor advisory
  5. 2026-08-30 02:04 UTCGHSA enrichment
  6. 2026-08-30 01:22 UTCEPSS rescore
  7. 2026-08-29 21:45 UTCVendor advisory
  8. 2026-08-29 21:45 UTCGHSA enrichment
  9. 2026-08-29 17:26 UTCVendor advisory
  10. 2026-08-29 17:26 UTCGHSA enrichment
  11. 2026-08-29 13:05 UTCVendor advisory
  12. 2026-08-29 13:05 UTCGHSA enrichment
  13. 2026-08-29 08:45 UTCVendor advisory
  14. 2026-08-29 08:45 UTCGHSA enrichment
  15. 2026-08-29 04:25 UTCVendor advisory
  16. 2026-08-29 04:25 UTCGHSA enrichment
  17. 2026-08-29 00:04 UTCEG score recompute
  18. 2026-08-29 00:04 UTCVendor advisory
  19. 2026-08-29 00:03 UTCGHSA enrichment
  20. 2026-08-28 21:41 UTCEPSS rescore
  21. 2026-08-28 19:42 UTCVendor advisory
  22. 2026-08-28 19:42 UTCGHSA enrichment
  23. 2026-08-28 15:58 UTCVendor advisory
  24. 2026-08-28 15:58 UTCGHSA enrichment
  25. 2026-08-28 11:38 UTCVendor advisory
Show 75 more
  1. 2026-08-28 11:38 UTCGHSA enrichment
  2. 2026-08-28 07:19 UTCVendor advisory
  3. 2026-08-28 07:19 UTCGHSA enrichment
  4. 2026-08-28 03:00 UTCVendor advisory
  5. 2026-08-28 03:00 UTCGHSA enrichment
  6. 2026-08-27 22:41 UTCVendor advisory
  7. 2026-08-27 22:41 UTCGHSA enrichment
  8. 2026-08-27 18:22 UTCEG score recompute
  9. 2026-08-27 18:22 UTCVendor advisory
  10. 2026-08-27 18:21 UTCGHSA enrichment
  11. 2026-08-27 17:22 UTCCISA KEV update
  12. 2026-08-27 14:25 UTCEPSS rescore
  13. 2026-08-27 14:00 UTCGHSA enrichment
  14. 2026-08-27 09:41 UTCVendor advisory
  15. 2026-08-27 09:41 UTCGHSA enrichment
  16. 2026-08-27 05:21 UTCVendor advisory
  17. 2026-08-27 05:21 UTCGHSA enrichment
  18. 2026-08-27 01:00 UTCVendor advisory
  19. 2026-08-27 01:00 UTCGHSA enrichment
  20. 2026-08-26 20:41 UTCVendor advisory
  21. 2026-08-26 20:41 UTCGHSA enrichment
  22. 2026-08-26 17:41 UTCCISA KEV update
  23. 2026-08-26 16:22 UTCVendor advisory
  24. 2026-08-26 16:22 UTCGHSA enrichment
  25. 2026-08-26 12:02 UTCVendor advisory
  26. 2026-08-26 12:02 UTCGHSA enrichment
  27. 2026-08-26 07:42 UTCVendor advisory
  28. 2026-08-26 07:42 UTCGHSA enrichment
  29. 2026-08-26 03:21 UTCVendor advisory
  30. 2026-08-26 03:21 UTCGHSA enrichment
  31. 2026-08-25 23:02 UTCVendor advisory
  32. 2026-08-25 23:02 UTCGHSA enrichment
  33. 2026-08-25 18:43 UTCVendor advisory
  34. 2026-08-25 18:43 UTCGHSA enrichment
  35. 2026-08-25 14:24 UTCEG score recompute
  36. 2026-08-25 14:24 UTCVendor advisory
  37. 2026-08-25 14:24 UTCGHSA enrichment
  38. 2026-08-25 13:49 UTCEPSS rescore
  39. 2026-08-25 10:05 UTCVendor advisory
  40. 2026-08-25 10:05 UTCGHSA enrichment
  41. 2026-08-25 05:46 UTCVendor advisory
  42. 2026-08-25 05:46 UTCGHSA enrichment
  43. 2026-08-25 01:27 UTCVendor advisory
  44. 2026-08-25 01:27 UTCGHSA enrichment
  45. 2026-08-24 21:08 UTCVendor advisory
  46. 2026-08-24 21:08 UTCGHSA enrichment
  47. 2026-08-24 20:30 UTCVendor advisory
  48. 2026-08-24 20:30 UTCGHSA enrichment
  49. 2026-08-24 18:52 UTCCISA KEV update
  50. 2026-08-24 16:11 UTCEG score recompute
  51. 2026-08-24 16:11 UTCVendor advisory
  52. 2026-08-24 16:11 UTCGHSA enrichment
  53. 2026-08-24 11:51 UTCEG score recompute
  54. 2026-08-24 11:51 UTCVendor advisory
  55. 2026-08-24 11:51 UTCGHSA enrichment
  56. 2026-08-24 07:31 UTCVendor advisory
  57. 2026-08-24 07:31 UTCGHSA enrichment
  58. 2026-08-24 03:12 UTCVendor advisory
  59. 2026-08-24 03:12 UTCGHSA enrichment
  60. 2026-08-23 22:52 UTCVendor advisory
  61. 2026-08-23 22:52 UTCGHSA enrichment
  62. 2026-08-23 18:33 UTCVendor advisory
  63. 2026-08-23 18:33 UTCGHSA enrichment
  64. 2026-08-23 14:14 UTCVendor advisory
  65. 2026-08-23 14:14 UTCGHSA enrichment
  66. 2026-08-23 09:55 UTCVendor advisory
  67. 2026-08-23 09:55 UTCGHSA enrichment
  68. 2026-08-23 05:35 UTCVendor advisory
  69. 2026-08-23 05:35 UTCGHSA enrichment
  70. 2026-08-23 01:17 UTCEG score recompute
  71. 2026-08-23 01:17 UTCVendor advisory
  72. 2026-08-23 01:16 UTCGHSA enrichment
  73. 2026-08-23 00:19 UTCEPSS rescore
  74. 2026-08-22 20:58 UTCVendor advisory
  75. 2026-08-22 20:58 UTCGHSA enrichment

Publicly available exploits

(2 references)

Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCWismanSec/sharepoint-2026-poc
    First seen Jul 26, 2026

    PoC, IOCs, and detection logic for the SharePoint /_trust WS-Federation BinaryFormatter deserialization chain. Lab reconstruction covering unauthenticated RCE, in-process machine key theft, and the artifacts each variant leaves behind. SharePoint 2016, 2019, and Subscription Edition. CVE-2026-50522, CVE-2026-45659, CVE-2026-56164, CVE-2026-58644.

    Open source ↗
  • GitHub PoC4minx/CVE-2026-50522
    First seen Jul 25, 2026

    CVE-2026-50522 PoC

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(6)

What is CVE-2026-50522?
CVE-2026-50522 is a critical vulnerability published on July 14, 2026. Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
When was CVE-2026-50522 disclosed?
CVE-2026-50522 was first published in the National Vulnerability Database on July 14, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-50522 actively exploited?
Yes. CISA added CVE-2026-50522 to the Known Exploited Vulnerabilities catalog on July 22, 2026, affecting Microsoft SharePoint. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2026-50522?
CVE-2026-50522 has a CVSS v4.0 base score of 9.8 (CNA self-assessment; NVD's own analysis pending).
Which products are affected by CVE-2026-50522?
CVE-2026-50522 affects Microsoft SharePoint. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2026-50522?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-50522, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-50522

Explore →

Is Your Infrastructure Affected by CVE-2026-50522?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs